Vendor-specific memory[ edit ] A common misuse is to write information to certain memory regions to bind vendor-specific memory modules to a specific system.
Fujitsu Technology Solutions is known to do this. Adding different memory module to the system usually results in a refusal or other counter-measures like pressing F1 on every boot.
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The system BIOS rejects memory modules that don't have this information starting at offset h. Some Packard Bell AMD laptops also use this method, in this case the symptoms can vary but it can lead to a flashing cursor rather than a beep pattern.
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Incidentally this can also be a symptom of BIOS corruption as well. There exist several programs that are able to read and modify SPD information on most, but not all motherboard chipsets. On Linux systems, the user space program decode-dimms  provided with i2c-tools  decodes and prints information on any memory with SPD information in the computer. On older Linux distributions, decode-dimms.
OpenBSD has included a driver spdmem 4 since version 4. The driver was ported from NetBSD, where it is available since release 5.
Coreboot reads and uses SPD information to initialize all memory controllers in a computer with timing, size and other properties. The method used is to pull low the A0,A1 lines so the internal memory shuts down, allowing the external device to access the SMBus.
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Once this is done, a custom Linux build or DOS application can then access the external device. A common use is recovering data from LCD panel memory chips to retrofit a generic panel into a proprietary laptop.
On some chips it is also a good idea to separate write protect lines so that the onboard chips do not get wiped during reprogramming.
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A related technique is rewriting the chip on webcams often included with many laptops as the bus speed is substantially higher and can even be modified so that 25x series chips can be read back for later cloning of the uEFI in the event of a chip failure.
On older equipment[ edit ] Some older equipment require the use of SIMMs with parallel presence detect more commonly called simply presence detect or PD.